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# JETPRO INFOTECH COMPANY, LTD.
MB-4F2
Processor 80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor 20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set FOREX
Max. Onboard 32MB
DRAM
Cache 64/128/256KB
BIOS AMI/AWARD
Dimensions 220.2mm x 250.2mm
I/O Options 32-bit local bus card slot
NPU Options 80387
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| External battery | JP2 | Turbo switch | JP15 |
|-------------------+----------+------------------+----------|
| Reset switch | JP8 | Turbo LED | JP16 |
|-------------------+----------+------------------+----------|
| Power LED & | JP9 | 32-bit local bus | S1 |
| keylock | | card | |
|-------------------+----------+------------------+----------|
| Speaker | JP10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal (internal | JP2 | pins 1 and |
| | battery) | | 2 closed |
|---+----------------------------------+--------+------------|
| | CMOS memory normal (external | JP2 | connected |
| | battery) | | |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP2 | open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP12 | JP13 | JP30 | W1B | W1C-K |
|-----------+------------+--------+--------+--------+--------|
| 80486DX2 | pins 1 & 2 | pins 1 | pins 1 | pins 1 | pins 1 |
| | | & 2 | & 2 | & 2 | & 2 |
|-----------+------------+--------+--------+--------+--------|
| 80486DX | pins 1 & 2 | pins 1 | pins 1 | pins 1 | pins 1 |
| | | & 2 | & 2 | & 2 | & 2 |
|-----------+------------+--------+--------+--------+--------|
| 80487SX | pins 1 & 2 | pins 1 | pins 2 | pins 1 | pins 1 |
| | | & 2 | & 3 | & 2 | & 2 |
|-----------+------------+--------+--------+--------+--------|
| 80486SX | pins 2 & 3 | pins 2 | pins 2 | pins 1 | pins 1 |
| | | & 3 | & 3 | & 2 | & 2 |
|-----------+------------+--------+--------+--------+--------|
| CX486DLC | N/A | N/A | N/A | pins 1 | pins 2 |
| | | | | & 2 | & 3 |
|-----------+------------+--------+--------+--------+--------|
| 80386DX | N/A | N/A | N/A | pins 2 | pins 2 |
| | | | | & 3 | & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache CACHE | Location | TAG(0) | TAG(1) |
|-------+-------------+------------+------------+------------|
| 64KB | (8) 8K x 8 | Banks 0 & | (1) 8K x 8 | NONE |
| | | 1 | | |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 | NONE |
|-------+-------------+------------+------------+------------|
| 256KB | (8) 32K x 8 | Banks 0 & | (1) 8K x 8 | (1) 8K x 8 |
| | | 1 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8A | JP8B | JP8C | JP8E | JP8F |
|-------+------------+----------+----------+--------+--------|
| 64KB | pins 2 & 3 | pins 1 & | pins 1 & | pins 2 | pins 1 |
| | | 2 | 2 | & 3 | & 2 |
|-------+------------+----------+----------+--------+--------|
| 128KB | pins 1 & 2 | pins 2 & | pins 2 & | pins 1 | pins 1 |
| | | 3 | 3 | & 2 | & 2 |
|-------+------------+----------+----------+--------+--------|
| 256KB | pins 2 & 3 | pins 1 & | pins 1 & | pins 1 | pins 2 |
| | | 2 | 2 | & 2 | & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+